diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b7dca26..f5c509e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,21 +19,13 @@ jobs:
     strategy:
       matrix:
         xcode:
-          - "26.2"
-          - "26.4"
+          - "26.5"
     steps:
       - uses: actions/checkout@v5
       - name: Select Xcode ${{ matrix.xcode }}
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
       - name: Print Swift version
         run: swift --version
-      - name: Install Simulator Runtimes
-        if: matrix.xcode != '26.2'
-        uses: nick-fields/retry@v3
-        with:
-          timeout_minutes: 15
-          max_attempts: 3
-          command: xcodebuild -downloadAllPlatforms
       - name: Run ${{ matrix.config }} tests
         run: CONFIG=${{ matrix.config }} make test-all
 
@@ -44,10 +36,10 @@ jobs:
       matrix:
         config: ["debug", "release"]
         swift:
-          - "6.0"
+          - "6.3"
     container: swift:${{ matrix.swift }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Run tests
         run: swift test -c ${{ matrix.config }}
 
@@ -55,7 +47,7 @@ jobs:
     name: Wasm
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: bytecodealliance/actions/wasmtime/setup@v1
       - name: Install Swift and Swift SDK for WebAssembly
         run: |
diff --git a/Package.resolved b/Package.resolved
index fffdf8d..fc60197 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -1,13 +1,13 @@
 {
-  "originHash" : "ed7ab9572c69a3dc124037a3b24680f7164dd032be3ba0cf3451ff4f654deccd",
+  "originHash" : "7dea21d8cce7027c9dcef7b962be55bc163c79be3e43fefa51d201d8d6dce177",
   "pins" : [
     {
       "identity" : "swift-concurrency-extras",
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/pointfreeco/swift-concurrency-extras",
       "state" : {
-        "revision" : "5a3825302b1a0d744183200915a47b508c828e6f",
-        "version" : "1.3.2"
+        "revision" : "a90e2e40a7a840a853dd29e57cbef5dbb72c9d5b",
+        "version" : "1.4.0"
       }
     },
     {
@@ -15,8 +15,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/apple/swift-docc-plugin",
       "state" : {
-        "revision" : "e977f65879f82b375a044c8837597f690c067da6",
-        "version" : "1.4.6"
+        "revision" : "647c708be89f834fa6a6d4945442793a77ddf5b6",
+        "version" : "1.5.0"
       }
     },
     {
@@ -29,12 +29,12 @@
       }
     },
     {
-      "identity" : "xctest-dynamic-overlay",
+      "identity" : "swift-issue-reporting",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/pointfreeco/xctest-dynamic-overlay",
+      "location" : "https://github.com/pointfreeco/swift-issue-reporting",
       "state" : {
-        "revision" : "dfd70507def84cb5fb821278448a262c6ff2bbad",
-        "version" : "1.9.0"
+        "revision" : "71c7c9a761d1ca6ed4ccb6ced040fe1c1a39e8e7",
+        "version" : "2.1.0"
       }
     }
   ],
diff --git a/Package.swift b/Package.swift
index 412e6f1..3a49115 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 6.0
+// swift-tools-version: 6.4
 
 import PackageDescription
 
@@ -8,10 +8,10 @@ let package = Package(
   //     so that depending libraries and applications can conditionally use the library via
   //     availability checks.
   platforms: [
-    .iOS(.v13),
-    .macOS(.v10_15),
-    .tvOS(.v13),
-    .watchOS(.v6),
+    .iOS(.v15),
+    .macOS(.v12),
+    .tvOS(.v15),
+    .watchOS(.v9),
   ],
   products: [
     .library(
@@ -22,14 +22,14 @@ let package = Package(
   dependencies: [
     .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
     .package(url: "https://github.com/pointfreeco/swift-concurrency-extras", from: "1.0.0"),
-    .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "1.2.2"),
+    .package(url: "https://github.com/pointfreeco/swift-issue-reporting", from: "2.1.0"),
   ],
   targets: [
     .target(
       name: "Clocks",
       dependencies: [
         .product(name: "ConcurrencyExtras", package: "swift-concurrency-extras"),
-        .product(name: "IssueReporting", package: "xctest-dynamic-overlay"),
+        .product(name: "IssueReporting", package: "swift-issue-reporting"),
       ]
     ),
     .testTarget(
diff --git a/Package@swift-6.0.swift b/Package@swift-6.0.swift
new file mode 100644
index 0000000..1f96df7
--- /dev/null
+++ b/Package@swift-6.0.swift
@@ -0,0 +1,55 @@
+// swift-tools-version: 6.0
+
+import PackageDescription
+
+let package = Package(
+  name: "swift-clocks",
+  // NB: While the `Clock` protocol is iOS 16+, etc., the package should support earlier platforms
+  //     so that depending libraries and applications can conditionally use the library via
+  //     availability checks.
+  platforms: [
+    .iOS(.v13),
+    .macOS(.v10_15),
+    .tvOS(.v13),
+    .watchOS(.v6),
+  ],
+  products: [
+    .library(
+      name: "Clocks",
+      targets: ["Clocks"]
+    )
+  ],
+  dependencies: [
+    .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
+    .package(url: "https://github.com/pointfreeco/swift-concurrency-extras", from: "1.0.0"),
+    .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "1.13.0"),
+  ],
+  targets: [
+    .target(
+      name: "Clocks",
+      dependencies: [
+        .product(name: "ConcurrencyExtras", package: "swift-concurrency-extras"),
+        .product(name: "IssueReporting", package: "xctest-dynamic-overlay"),
+      ]
+    ),
+    .testTarget(
+      name: "ClocksTests",
+      dependencies: [
+        "Clocks"
+      ]
+    ),
+  ],
+  swiftLanguageModes: [.v6]
+)
+
+for target in package.targets {
+  target.swiftSettings = target.swiftSettings ?? []
+  target.swiftSettings?.append(contentsOf: [
+    .enableUpcomingFeature("ExistentialAny"),
+    .enableUpcomingFeature("ImmutableWeakCaptures"),
+    .enableUpcomingFeature("InferIsolatedConformances"),
+    .enableUpcomingFeature("InternalImportsByDefault"),
+    .enableUpcomingFeature("MemberImportVisibility"),
+    .enableUpcomingFeature("NonisolatedNonsendingByDefault"),
+  ])
+}